Designation: F3125/F3125M − 18Standard Specification forHigh Strength Structural Bolts and Assemblies, Steel andAlloy Steel, Heat Treated, Inch Dimensions 120 ksi and 150ksi Minimum Tensile Strength, and Metric Dimensions 830MPa and 1040 MPa Minimum Tensile Strength1This standard is issued under the fixed designation F3125/F3125M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers chemical, physical and me-chanical requirements for quenched and tempered bolts manu-factured from steel and alloy steel, in inch and metricdimensions, in two strength grades, two types and two styles.1.1.1 This specification is a consolidation and replacementof six ASTM standards, including; A325, A325M, A490,A490M, F1852 and F2280.1.1.2 This consolidated standard is to ensure alignmentbetween standards with the same intended end use and tosimplify the use and maintenance of structural bolt specifica-tions.1.2 Intended Use:1.2.1 Bolts manufactured under this specification are in-tended for use in structural connections covered in the Speci-fication for Structural Joints Using High-Strength Bolts, asapproved by the Research Council on Structural Connections.1.2.2 Bolts in this specification are furnished in sizes from1⁄2 to 1-1⁄2 in. inclusive and from M12 to M36 inclusive.1.3 Classification, Table 1:1.3.1 Bolts are designated by grade, which indicates inch ormetric strength and style.1.3.2 Bolts are designated by type denoting raw materialchemical composition.1.3.3 Bolts are designated by style denoting Heavy Hexbolts or “Twist-Off” Style assemblies.1.4 Terms used in this specification are defined in F1789.1.5 Units—The values stated in either SI units or inch poundunits are to be regarded separately as standard. The valuesstated in each system may not be exact equivalents; therefore,each system shall be used independently of the other. Combin-ing values from the two systems may result in non-conformance with the standard.1.6 Table footnotes are requirements. Notes are advisory.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A194/A194M Specification for Carbon Steel, Alloy Steel,and Stainless Steel Nuts for Bolts for High Pressure orHigh Temperature Service, or BothA354 Specification for Quenched and Tempered Alloy SteelBolts, Studs, and Other Externally Threaded FastenersA449 Specification for Hex Cap Screws, Bolts and Studs,Steel, Heat Treated, 120/105/90 ksi Minimum TensileStrength, General UseA563 Specification for Carbon and Alloy Steel NutsA563M Specification for Carbon andAlloy Steel Nuts (Met-ric)A751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsB695 Specification for Coatings of Zinc Mechanically De-posited on Iron and SteelE709 Guide for Magnetic Particle TestingE1444/E1444M Practice for Magnetic Particle Testing1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Nuts, Rivets and Washers.Current edition approved Dec. 1, 2018. Published February 2019. Originallypublished in 2015. Last previous edition published in 2015 as F3125–15. DOI:10.1520/F3125_F3125M–15A.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at
[email protected] For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1Copyright by ASTM Int l (all rights reserved); Tue Oct 22 15:51:29 EDT 2019Downloaded/printed byUniversity of Michigan (University of Michigan) pursuant to License Agreement. No further reproductions authorized.F436/F436M Specification for Hardened Steel Washers Inchand Metric DimensionsF606/F606M Test Methods for Determining the MechanicalProperties of Externally and Internally ThreadedFasteners, Washers, Direct Tension Indicators, and RivetsF788 Specification for Surface Discontinuities of Bolts,Screws, and Studs, Inch and Metric SeriesF1136/F1136M Specification for Zinc/Aluminum CorrosionProtective Coatings for FastenersF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlement in Plated or CoatedFastenersF2328 Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts, Screws, Studs, and NutsF2328M Test Method for Determining Decarburization andCarburization in Hardened and Tempered Threaded SteelBolts, Screws, Studs, and Nuts (Metric)F2329 Specification for Zinc Coating, Hot-Dip, Require-ments for Application to Carbon and Alloy Steel Bolts,Screws, Washers, Nuts, and Special Threaded FastenersF2660 Test Method for Qualifying Coatings for Use onA490 Structural Bolts Relative to Environmental Hydro-gen EmbrittlementF2833 Specification for Corrosion Protective Fastener Coat-ings with Zinc Rich Base Coat and Aluminum Organic/Inorganic TypeF3019/F3019M Specification for Chromium Free Zinc-Flake Composite, with or without Integral Lubricant,Corrosion Protective Coatings for FastenersG101 Guide for Estimating the Atmospheric Corrosion Re-sistance of Low-Alloy Steels2.2 ASME Standards:3B1.1 Unified Screw ThreadsB1.13M Metric Screw ThreadsB18.18 Quality Assurance for FastenersB18.2.6 Fasteners for Use in Structural ApplicationsB18.2.6M Metric Fasteners for Use in Structural Applica-tions2.3 IFI Standard:4IFI 144 Test Evaluation Procedures for Coating Qualifica-tion2.4 RCSC Standard:5Specification for Structural Joints Using High-Strength Bolts3. Ordering Information3.1 Orders for bolts under this specification shall include:3.1.1 ASTM designation.3.1.2 Quantity: Number of bolts or assemblies, includingwashers, if required.3.1.3 Size: Including nominal bolt diameter and bolt length,and thread pitch if other than standard.3.1.4 Grade: A325, A490, F1852, F2280 or A325M,A490M.3.1.5 Type: Type 1 or Type 3. When Type is not specifiedeither Type 1 or Type 3 may be furnished at the supplier’soption.3.1.6 Style: Heavy Hex or Twist-Off Style.3.1.7 Coatings or finishes: If other than plain finish, specifythe coating process or finish required, see Annex A1.3.2 Test reports, see Section 14.3.3 Additional details of other assembly components suchas nuts and washers, if required.3.4 Rotational capacity testing of matched sets or assem-blies in accordance with Annex A2, as required in 8.1.5 andwhen requested by the purchaser.3.5 Heavy Hex bolts may be ordered individually, packagedwith nuts, packaged with nuts and washers, or as assemblies.3.6 Any special observation or inspection requirementsshall be specified at the time of inquiry and at the time of order.See Section 13.2.3.7 Any supplementary requirements.3.8 Country of origin requirements, if any.NOTE 1—Atypical description follows: 1000 pieces3⁄4 in.× 3 in.ASTMF3125–15, Grade A325 Heavy Hex Bolt, Type 1, each with oneASTM F436/F436M Type 1 Hardened Washer, and one A563 Grade DHHeavy Hex Nut.NOTE 2—Bolts are sometimes detailed with names such as A325 HS,A325 SC, A325 X or A490 N. These names relate to connection designand bolt installation, but do not change the manufacturing requirementsand are preferably not shown on bolt orders.4. Dimensions4.1 Head and Body:4.1.1 Bolts shall conform to the dimensions specified inTable 2 for Heavy Hex or Twist-Off bolts.4.1.2 The thread length shall not be changed except asprovided in Supplementary Requirement S1 or S2. Otherdimensions shall not be changed except in accordance withSupplementary Requirement S2.4.1.3 Bolts with thread lengths or dimensional requirementswhich differ from this specification may also be ordered under3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Two Park Ave., New York, NY 10016-5990, http://www.asme.org.4Industrial Fasteners Institute (IFI), 6363 Oak Tree Blvd. Independence, OH44131. http://www.indfast.org5Research Council on Structural Connections (RCSC), http://boltcouncil.orgTABLE 1 ClassificationGrade Min. Strength TypeAStyleA325 120 ksi 1 3 Heavy Hex HeadA490 150 ksi 1 3 Heavy Hex HeadF1852 120 ksi 1 3 Twist-OffF2280 150 ksi 1 3 Twist-OffA325M 830 MPa 1 3 Heavy Hex HeadA490M 1040 MPa 1 3 Heavy Hex HeadAType 1 - 120 ksi (830 MPa) - carbon steel, carbon boron steel, alloy steel or alloysteel with boron additionType 3 - 120 ksi (830 MPa) or 150 ksi (1040 MPa) - weathering steelType 1 - 150 ksi (1040 MPa) - alloy steel or alloy steel with boron additionF3125/F3125M − 182Copyright by ASTM Int l (all rights reserved); Tue Oct 22 15:51:29 EDT 2019Downloaded/printed byUniversity of Michigan (University of Michigan) pursuant to License Agreement. No further reproductions authorized.Specification A449 or A354. Users should note that A449 andA354 are not exact equivalents to the structural grades in thisspecification.4.2 Threads:4.2.1 Uncoated bolt threads shall be as specified in Table 2.4.2.2 Coated bolts shall have threads meeting Table 2requirements before coating.4.3 The gauging limit for coated bolts shall be verifiedduring manufacture. In case of dispute, a calibrated thread ringgauge of the same size as the oversize limit in AnnexA1 (ClassX tolerance, gauge tolerance plus) shall be used to verifycompliance. The gauge shall assemble with hand effort follow-ing application of light machine oil to prevent galling anddamage to the gauge. These inspections, when performed toTABLE 2 Dimensions, Threads, Marking, Matching ComponentsInch Metric120 ksi Min Tensile 150 ksi Min Tensile 830 MPa Min Tensile 1040 MPa Min TensileType 1 Type 3 Type 1 Type 3 Type 1 Type 3 Type 1 Type 3Style - Heavy HexBoltsDimensions, ASMEBB18.2.6 B18.2.6 B18.2.6 B18.2.6 B18.2.6M B18.2.6M B18.2.6M B18.2.6MThread Fit, ASMEBB1.1 UNC 2A B1.1 UNC 2A B1.1 UNC 2A B1.1 UNC 2A B1.13M MC 6g B1.13M MC 6g B1.13M MC 6g B1.13M MC 6gGrade MarkingA,DA325 A325 A490 A490 A325M A325M A490M A490MStyle - Twist-OffBoltsDimensions, ASMEBB18.2.6 B18.2.6 B18.2.6 B18.2.6FFFFThread Fit, ASMEBB1.1 UNC 2A B1.1 UNC 2A B1.1 UNC 2A B1.1 UNC 2AGrade MarkingA,DA325TC A325TC A490TC A490TCAlt. MarkingA,CA325 A325 A490 A490FFFFRecommended Nutand WasherPlain Nut A563 DH A563 DH3 A563 DH A563 DH3 A563M 10S A563M 10S3 A563M 10S A563M 10S3Suitable AlternativeEDH3, D, C, C3 C3 8S, 8S3, 10S3 8S3 10S3Coated Nut A563 DH A563 DH3 A563 DH A563 DH3 A563M 10S A563M 10S3 A563M 10S A563M 10S3Flat, Bevel orThick Washer ifusedF436/F436M -1 F436/F436M -3 F436/F436M -1 F436/F436M -3 F436/F436M -1 F436/F436M -3F436/F436M -1 F436/F436M -3AA325 and A325M bolts lengths up to 4D which are fully threaded but which are not required to be fully threaded by the relevant ASME standard shall be marked witha “T”, see Supplementary Requirement S1. Bolts with any other non-standard dimensions, including non-standard thread length (except for bolts up to 4D threaded fullyand marked with “T” per S1 requirement), shall be marked with an “S”, see Supplementary Requirement S2.BManufactured to the latest revision at the time of manufacture, UNC for inch series and Metric Coarse (MC) for Metric Series.CPreviously used markings may be sold and used indefinitely, bolts must be manufactured to current marking requirements upon initial publication of this standard.DOther distinguishing markings for type 3 are permitted at the manufacturers option.EASTM A194/A194M 2H Heavy Hex inch Nuts may be used in place of A563 DH nuts on type 1 A325, A490, F1852 and F2280 bolts. 2H Heavy Hex metric Nuts maybe used in place of A563M 10S nuts on type 1 A325M and A490M bolts. When coated 2H nuts are used in place of DH or 10S nuts, the same requirements of A563, A563M,and this specification, including Annex A1, shall apply. These requirements include, but are not limited to, thread dimensions and overtapping allowances, coating grade,lubrication requirements, and proof load testing.FMetric dimensions and requirements for this style have not been established.TABLE 3 Chemical RequirementsAHeat Analysis120 ksi/830 MPa Minimum 150 ksi/1040 MPa MinimumGrade A325, A325M, F1852 Grade A490, A490M, F2280Type 1 Type 3 Type 1 Type 3Carbon or AlloySteelwith or withoutBoronCompositionACompositionBBased onCorrosion IndexBAlloy Steelwith or withoutBoronBased onCorrosion IndexBCarbon 0.30 - 0.52 0.33 - 0.40 0.38 -0.48 0.30 - 0.52 max 0.30 - 0.48C0.30 - 0.53Manganese 0.60 min 0.90 - 1.20 0.70 - 0.90 0.60 min 0.60 min 0.60 minPhosphorus, max 0.035 0.035 0.035 0.035 0.035 0.035Sulfur, max 0.040 0.040 0.040 0.040 0.040 0.040Silicon 0.15 - 0.30 0.15 - .30 0.30 - 0.50DDDBoron 0.003 maxDDD0.003 maxDCopperD0.25 - 0.45 0.20 - 0.40 0.20 - 0.60D0.20 - 0.60NickelD0.25 - 0.45 0.50 - 0.80 0.20EminD0.20EminChromiumD0.45 - 0.65 0.50 - 0.75 0.45 minD0.45 minVanadiumDDDDDDMolybdenumDD0.06 max 0.10EminD0.10EminTitaniumABased on heat analysis.BSee 6.3.CCarbon requirement is 0.35-0.53 for 1-1⁄2 in. and M36 diameter bolts.DNot Specified.EMaterial that satisfies the criteria for either Nickel or Molybdenum shall be considered as satisfying the requirements for both elements.F3125/F3125M − 183Copyright by ASTM Int l (all rights reserved); Tue Oct 22 15:51:29 EDT 2019Downloaded/printed byUniversity of Michigan (University of Michigan) pursuant to License Agreement. No further reproductions authorized.resolve controversy, shall be conducted at the frequencyspecified in the quality provisions of ASME B18.18.NOTE 3—It is the intent of this specification that coated nuts and boltsassemble freely when ordered together. It is recognized that the batchnature of coating process and the cumulative effect of coating thicknessmay create intermittent assembly problems. Staying within the materiallim
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